#include <REGX52.H>
void Delay(unsigned int xms)	//@12.000MHz
{
	unsigned char data i, j;
    while(xms--)
	{
		i = 2;
	j = 239;
	do
	{
		while (--j);
	} while (--i);
	}
}
void main()
{
	while(1)
	{
		if(P3_1==0)
		{
			Delay(20);
	while(P3_1==0);
		Delay(20);
	
	
		P2_0=~P2_0;
		}
	}
}
